Free online calendar application software for linux

NetCalendar is a network capable and mostly UNIX /usr/bin/calendar database compatible Calendar application programmed in Java.

NetCalendars initial motivaion was a programming project at the Aachen University of Applied Sciences for the object oriented programming class. But it became much more than just that!

Rainlendar project is a customizable desktop calendar.
Rainlendar is a feature rich calendar application that is easy to use and doesnt take much space on your desktop. The application is platform independent so you can run it both on Windows and on Linux. The appearance can be customized with skins and you can even mix different skins together.
It is possible to use Rainlendar with other calendar applications too. Rainlendar uses the standard iCalendar format to store its events and tasks so you can easily transfer them between applications. You can also subscribe to online calendars and see your Outlook appointments directly in Rainlendar*.
Rainlendar is an unicode application and support localization so you can use it on your own language.
All the coming events are shown in a separate list where you can see the weeks events at one glance. You can decide how many days in advance you want to see in the list. Different events can have a different appearance in the list so you can easily spot the important events from the others. The icons in the calendar are also available in the event list and other windows to make it easier to separate the events.
You can also have a separate list for your long term tasks. The task list can be arranged several ways so that you can keep it better organized. You can also set a due date for the tasks to make sure youll remember to do them on time.
Youll also get an alarm when an event or task is due so that you dont miss it. The alarm can be defined to be set off any duration before the actual event so you have time to prepare for it.
And thats not all. Check the list of features for better overview of all the things Rainlendar can do. If you find it useful go to the download page and get yourself a copy.
*Network shared calendars and Outlook support are available only in the Pro version
Main features:
- Small and lightweight
- Different type events can have different appearence
- Supports Windows transparency
- Synchronizes events between several clients
- Localized for multiple languages
- Shows an alarm when an event is due
- Shows Outlooks appointments
- Includes a todo-list
- Works also as Litestep plugin
- Displays the current date in tray icon
- Can stick to the desktop (i.e. doesnt hide with Show Desktop)
- Hotkeys for quick access
- Easy skinning with an UI
- Can be controlled from 3rd party applications with !bangs

GPE calendar stores and manages scheduled events. GPE calendar supports entries without due times, recurring events (birthdays or other anniversaries), and different view modes to give the user a good overview.
Main features:
- Entries without due-time, just a note for a particular day.
- Recurring events with options for daily, workdays, weekends, monthly, yearly (birthdays or other anniversaries)
- Different view modes to give the user a good overview.

Darwin Calendar Server provides a CalDAV server.

The Darwin Calendar Server is a standards-compliant server that allows multiple users to collaboratively share calendaring information. It provides a shared location on the network to store schedules, and allows users to send each other and manage invitations.

In order to provide interoperability with multiple calendaring clients, the server implements the CalDAV protocol, which is an extension of WebDAV, which is in turn an extension of HTTP.

Simple PHP Calendar is a a simple, extensible PHP calendar class. The project focuses exclusively on generating an HTML representation for a given month. It is meant to be easily extended for use in other applications, such as input widgets for forms, or full event calendaring applications. Its output is completely customizable via CSS.
A simple example
After downloading the class and including it in your PHP script, youre ready to start using it. The constructor requires two paramets, a year and month. The following code produces a very plain looking calendar.
1 require_once( class.Calendar.php );
2 $cal = new Calendar (2004, 3 );
3 echo "".$cal->getFullMonthName()."";
4 echo $cal->display();
Customizing the display
You can use two methods to change how the calendar is displayed. Use setTableWidth to define how wide to make the table, in pixels or as a percentage of the screen. Use setDayNameFormat to change how weekdays are displayed in the header row using strftime formats.
1 require_once(class.Calendar.php);
2 $calendar = new Calendar (2004, 4);
3 $calendar->setTableWidth(50%);
4 $calendar->setDayNameFormat(%A);
5 echo "".$calendar->getBriefMonthName().";
6 echo $calendar->display();
Final Example
You can use CSS selectors to control the formatting of all aspects of the calendar, including adding borders and how empty boxes display. Lets wrap our talbe in a div named calendar and use the following styles.
/* overall table */
#calendar table {
border:1px solid #fff;
padding: 0;
margin:20px;
}
/* the day headers across the top */
#calendar th {
background: #565;
color: #fff;
margin: 3px;
padding: 2px 5px;
}
/* how days this month will look, make dates appear in top right */
#calendar td {
background: #eee;
color: #000;
padding: 2px;
margin:0;
height:60px;
text-align:right;
vertical-align:top;
border:1px solid #fff;
}
/* these are the days falling outside this month */
#calendar td.notInMonth {
background: #999;
}
Enhancements:
- The documentation has been polished.
- An example has been added for extending the class to customize how a calendar grid will display.